Artificial-tooth structure



Jan. 7, 1930. WVM. FLOYD 11,742,310

ARTIFICIAL TOOTH STRUCTURE Filed March 24, 192? I nl/enior.

William M. F/qya Patented Jan. 7, 1930 UNITED STATES WILLIAM M. FnoYn, or TORONTO, oNrARI cannula, .assrerrom iay nnsmmjnssrcm MENTS, TO IDEAL 'roo'rn, 11m, or CAMBRIDGE MASSAGH;USETTS, aconronnrron,

AItTIFIcIAL-Toornlstritnc rurtn Application filed March 24, 1927. Serial m5. 173,046;

The principal objects of the invention are to provide an extremely strong form of porcelain tooth which will enable the use of a very I rigid bridge structure and which will simplify the mechanical work in the making of the bridge.

A further important object'is to provide a form of tooth which will be very sanitary enabling the user to thoroughly cleanse the gums around the teeth. I

The principal features of the invention consist in the novel construction and arrangement of a solid porcelain tooth with a transverse slot opening to the back thereof, and

a rigid metal barfitting snugly in said slot and secured by a pin fitted in a holebored axially of the tooth.

In the drawings, Figure 1 is a front eleva tional view of abridge structure constructed in accord with this invention.

Figure 2 is an elevational View of the back of the structure shown in Figure 1.

Figure 3 is a vertical section through the line 33 of Figure 2. Figure t is a perspective detail of the metal bridge structure shown inFigure 2, the porcelain teeth being removed. l j

Figure 5 is an enlarged perspective view of a tooth showing the metal bridge structure and the fastening pin ready to be assembled.

In the construction of tooth herein shown, the tooth lis formedof a solid block of porcelain moulded to the exact shape of the natural tooth with a suitably shaped top adapted to fit into the hollow in the gum from which the natural tooth has been extracted or to fit snugly against the gum surface.

The body of the tooth is cut transversely by a slot 2 arranged a desirable distance above the cusps. Thisslot extends inwardly from the back ofthe tooth well past the centre and it is tapered inwardly from the back to a rounded apex 3. The edges 4 of the slot are beveled outwardly. I

The bridge structure is formed of a bar 5 of metal cast with wedge-shaped portions 6 having the flat surfaces thereof tapered to fit snugly into the slot 2 of each tooth and a flaring beveled rim 7 extends outwardly from the beveled surfaces to correspond withthe tudina-l axis and the hole-8 intersects the-s ct 2backof1its apex. a I

The bridge bar 5 is r newals a hole 9 which. registers with the; hole 8 theatre. When the tooth has been placed "on" the bridge' structure, being"suitahlyfeementedgi a'pin 10' is i-nsertedinto'the liolej, being-bedded in cement, and passing through the hole-9? saidpinlocks the tooth securely onthe bri-dge structure. After the pin has beeninserted it is severedbelow the cusp surface andthehole is filled in with cement. This filling beingon the working surface of the tooth is elfeetive lyhidden. I q I llhe bridge bar 5" is provided with suitable means-for securing same to adjacent teeth, suchas'inlaysor as here shown with crowns bridge structure constructed asd'escribed permits the? use of agvery heavy bridge: bar whiclr will stand very heavy pressure without distortion and the flange rims 7 which extend back of the teeth further stifien same.

The teeth being of a solid block of porcelain are very strong and the bridge bar is in- I corporated thereinto in a very solid manner.

It will be readily understood that in a bridge structure such as described the metal supporting bar will be well away from the gums and the upper endsof the teeth may befitted to the gums in a natural position so that there will be openingsabove the bridge bar which will enable the thorough cleansing of the teeth around the gums. In such a structure the metal is completely hidden from outside and the teeth will appear perfectly natural.

What I claim as my invention is:

1. An artificial tooth structure, comprising a solid procelain tooth having a horizontally disposed slot extending transversely from side to side, said slot opening from the back and extending forwardly beyond the vertical axis of the tooth, a rigid metal bridge bar extending transversely of the tooth and beddedin said slot, and a pin arranged insaid tooth in vertical axial relation thereto and le)xtending transversely through said slot and 2. An artificial tooth structure, compris' ing a solid porcelain tooth having a transverse slot extending from side to side the opposing walls of which converge inwardly from the back, said opposed convergent walls having a continuous beveled edge and a metal brid e bar having convergent surfaces" extending across said tooth through the slot and-having flaring rims extending beyond the convergent surfaces and fitting against said continuous bevelled edge and conforming to the contour of the tooth.

3. An artificial tooth structure, comprising a solid porcelain tooth having a tapered transverse slot extending from side to side and a hole extending longitudinally of the vertical axis of the tooth and intersecting the slot, a rigid tapered metal bar arranged transversely of the tooth and fittedin said slot and having a hole'therethrough registering with the axial hole in the tooth, and a fastening in passing through said aligned holes and dded in the tooth and securing the tooth to the bar with thetapered part of the latter in ri 'd association with the convergent walls 7 of said slot. r

4. An artificial tooth structure, comprising a a metal bar having horizontal Wedge-shaped rtions taperin rom a flanged back, porceain teeth each aving a horizontal wedgesha ed slot extendin inwardly from the bacE thereof and extending transversely from a side to side of the tooth, and fastening pins extending longitudinally of the vertical axes of the teeth and extending through the wedge-shaped portions of said bar.

WM. M. FLOYD. 

